golang-file/golang-file.go

package gofile

import (
    "fmt"
    "os"
    "io/fs"
    "time"
)

type FileStats struct {
    Name string
    Size int64
    Mode fs.FileMode
    ModTime time.Time
    IsDir bool        
}

/*
*   * Delete a file
*/
func DeleteFile(file string) (int64,error) {
    if file == "" {
        panic("DeleteFile(): file parameter empty. Aborting.")
    }

    err := os.Remove(file)
	if err != nil {
        return 1, fmt.Errorf("DeleteFile(): %v", err)
    }
	
	return 0, nil
}


/*
*   * Delete a directory AND subdirectories
*/
func DeleteDir(dir string) (int64,error) {
    if dir == "" {
        panic("DeleteDir(): file parameter empty. Aborting.")
    }

    err := os.RemoveAll(dir)
    if err != nil {
        return 1, fmt.Errorf("DeleteFile(): %v", err)
    }
	
	return 0, nil
}


/*
*   * Move a file
*/


/*
*   * Create an empty file
*/
func CreateFile(file string, mode os.FileMode) (int64,error) {
    if file == "" {
        panic("Write(): file parameter empty. Aborting.")
    }

    f, err := os.Create(file)
    defer f.Close()
    if err != nil {
        return 1, fmt.Errorf("CreateFile(): %v", err)
    }

	err = os.Chmod(file, mode)
	if err != nil {
        return 1, fmt.Errorf("CreateFile(): %v", err)
	}

	return 0, nil
}


/*
*   * Create a directory but do not and silently ignore if the directory already exists
*/
func CreateDir(dir string, mode os.FileMode) (int64,error) {
    if dir == "" {
        panic("CreateDir(): dir parameter empty. Aborting.")
    }

	//blacklist = []string{
	//	"/", "/bin", "/boot", "/dev", "/etc", "/home", "/lib", "/lib64", "/media", "/mnt", "/opt", "/root", "/run", "/sbin", "/srv", "/sys", "/tmp", "/usr", "/var"
	//}

	_, err := os.Stat(dir)
	if err != nil {
    	if os.IsNotExist(err) {
        	fmt.Printf("CreateDir(): directory %s does not exist\n", dir)
        	//return 1, fmt.Errorf("CreateDir(): %v", err)
		} else {
        	return 1, fmt.Errorf("CreateDir(): %v", err)
		}
	}
	
	err = os.Mkdir(dir, mode)
	if err != nil {
		return 1, fmt.Errorf("CreateDir(): %v", err)
	}
	
	return 0, nil

    /*if _, err := os.Stat(dir); os.IsNotExist(err) {
        fmt.Println("Directory ", dir, "already exists")
        err := os.Mkdir(dir, mode)
        check(err)
    } else {
        fmt.Println(dir, "does exist!")
    }*/
}

/*
*   * Create a directory but do not and silently ignore if the directory already exists
*/
func CreateDirAll(dir string, mode os.FileMode) {
    if dir == "" {
        panic("CreateDir(): dir parameter empty. Aborting.")
    }

    if _, err := os.Stat(dir); os.IsNotExist(err) {
        err := os.MkdirAll(dir, mode)
        check(err)
    } else {
        fmt.Println(dir, "already exist!")
    }
}


/*
*   * Read data from a file and return it as []byte
*/
func Read(file string) []byte {
    if file == "" {
        panic("Write(): file parameter empty. Aborting.")
    }

    text, err := os.ReadFile(file)
    check(err)

    //fmt.Println(string(text))

    return text
}


/*
*   * Create a new file or overwrite an existing file
*/
func Write(file string, text string, mode os.FileMode) (int64,error) {
    if file == "" {
        panic("Write(): file parameter empty. Aborting.")
    }
    
    if len(text) <= 0 {
        panic("Write(): text parameter empty. Aborting.")
    }
	
	text_with_newline := fmt.Sprintf("%s\n", text)
	text_byte := []byte(text_with_newline)

    err := os.WriteFile(file, text_byte, mode)
    if err != nil {
		return 1, fmt.Errorf("Write(): %v", err)
	}
    
    return 0, nil
}


/*
*   * Append data to a file and return err 
*/
func Append(file string, text string, mode os.FileMode) (int64,error) {
    if file == "" {
        panic("Write(): file parameter empty. Aborting.")
    }
    
    if len(text) <= 0 {
        panic("Write(): text parameter empty. Aborting.")
    }

	//f, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, mode)
    f, err := os.OpenFile(file, os.O_WRONLY|os.O_CREATE|os.O_APPEND, mode)
    defer f.Close()
	if err != nil {
		return 1, fmt.Errorf("Append(): %v", err)
	}

    _, err = f.WriteString(text + "\n")
    if err != nil {
		return 1, fmt.Errorf("Append(): %v", err)
	}

	return 0, nil
}


/*
*   * Get information about a file and return as a struct 
*/
func Stats(dir string) FileStats {
    if dir == "" {
        panic("Stats(): dir parameter empty. Aborting.")
    }

    fi, err := os.Stat(dir)
    check(err)

    return FileStats {
        Name: fi.Name(),
        Size: fi.Size(),
        Mode: fi.Mode(),
        ModTime: fi.ModTime(),
        IsDir: fi.IsDir(),
    }
}


/*
*   * Read files in a directory and return a list 
*/
func ReadDir(dir string) []string {
    parsed_files := []string{}

    if dir == "" {
        panic("ReadDir(): dir parameter empty. Aborting.")
    }

    f, err := os.Open(dir)
    check(err)

    files, err := f.Readdir(0)
    check(err)

    for _, v := range files {
        parsed_files = append(parsed_files, v.Name())
    }

    //fmt.Println(parsed_files)

    return parsed_files
}


/*
*   * Receives error as a parameter and panics if error is not null
*/
func check(e error) {
    if e != nil {
        panic(e)
    }
}

//var db *sql.DB












//var src_dir = "/etc"

//func mysort(names []string) []string {
    //names := []string{"paul","john","michaels"
//    sorted_names := []string{}

//    if len(names) > 1 {
//        for index, name := range names {
//            fmt.Printf("Index: %v, Value: %v\n",index,name)
//            sorted_names = append(sorted_names, names[index])
//        }
//    } else {
//        fmt.Println("names is empty!")
//    }

    //fmt.Println(10)
//    return sorted_names
//}


//func main() {

    //dbcfg := mysql.Config{
    //    User: "root",
    //    Passwd: "",
    //    Net: "tcp",
    //    Addr: "localhost:3306",
    //    DBName: "mysql" 
    //}

    //greeting := "hello there friends!"

// fmt.Println(strings.Contains(greeting, "hello!"))
// fmt.Println(strings.ReplaceAll(greeting, "hello!", "hi"))
// fmt.Println(strings.ToUpper(greeting))
// fmt.Println(strings.Index(greeting, "th"))
// fmt.Println(strings.Splt(greeting, " "))
//ages := []int{1,2,3,i4,5,6,7,8,9};
//names := []string{"paul","john","michaels"}
// sort.Ints(ages)
// sort.Strings(names)
//fmt.Println(sort.SearchStrings(names,"paul"))
//https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqazNFaDR4R1RPQVZoUVpyZUlwcThaRmc4OXZFZ3xBQ3Jtc0tscFJDQW5pWjZGa0QzZHZnRy1fbWpCYXF4UUNFOEoyNjJlcGRQaWl2WVhpRGktbG9tdnFlVUVqVkczSS0zSnVXZFBzTGktUHJaaUx6eUVxWmpORkVfRldTY1hxTVQ4aXdLa3lVWnVJZkNOSlpXYnZNMA&q=https%3A%2F%2Fgolang.org%2Fpkg%2F&v=BoooHY57RXw
//    fmt.Println(mysort(names))
//}